Celebrity stylist and reality TV star Rachel Zoe says her biggest fear is that she won’t be able to get pregnant or carry a child to term. But experts tell HollyBaby.com that she’s way too underweight to even be able to conceive.

Anyone who’s been watching Rachel Zoe‘s reality show lately has seen her husband, Rodger Berman, putting pressure on her to finally start a family, but the celeb stylist seems to be coming up with a ton of excuses. If she really does want to have a child, an expert tells HollyBaby.com that she needs to start packing on the pounds, or she’ll never get pregnant! “She can talk about babies all she wants but it’s very unlikely she can have one,” says Dr. Fred Pescatore.

According to Dr. Pescatore there is no way the super-skinny 39-year-old could conceive at her current weight, which is estimated to be about 80 pounds. “I would be surprised if she’s actually getting a period because her body fat is almost nil,” he says. “Most women that underweight stop menstruating entirely, because the body needs some fat in order to function properly.”

Unless the stylist starts eating more and gaining weight as soon as possible, her motherhood dreams will never become a reality. “She absolutely needs to gain at least 10 to 15 pounds before she can even think about getting pregnant,” says Dr. Pescatore.

An insider close to the stylist confirms to HollyBaby.com that Rachel definitely wants to be a mother and has been thinking about it for a long time. “She and Rodger are just a normal couple who wonder if they’ll ever get to the point of becoming parents,” the insider says.

On her reality show The Rachel Zoe Project, she mentioned that she’s not afraid of gaining the inevitable pregnancy weight, but she does recognize that she might be too frail to carry a baby to term. “It’s the only thing in my life that I’m afraid of,” says Rachel about the possibility of having a miscarriage. “I’m just trying to wrap my head around carrying a child in my stomach. Am I physically strong enough? I can’t emotionally handle it if it doesn’t work,” she admits.

Dr. Pescatore agrees that her concerns are legitimate. “A growing baby needs nourishment and currently her body has nothing to give,” he warns. The doctor stresses that if Rachel is serious about starting a family she’s going to start eating more. “Rachel needs to incorporate more heart healthy fats including avocado and nuts into her diet, as well as whole grain carbohydrates like brown rice, quinoa and sweet potatoes, while keeping sugar consumption to a minimum,” he says.